CN103905767A - Display data channel switching device and display data channel switching method - Google Patents
Display data channel switching device and display data channel switching method Download PDFInfo
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Abstract
A display data channel switching device is coupled between a digital image transmission device and a digital image receiving device. The display data channel switching device comprises a display data channel, a storage unit, a switching unit and a judging unit. The display data channel transmits the extended display identification information signal or the high bandwidth digital content protection signal key. The storage unit stores extended display identification information data. The judging unit judges whether the display data channel transmits the extended display identification information signal or the key of the high-bandwidth digital content protection signal, and generates a switching signal to the switching unit according to the judgment result. The switching unit selectively couples the digital image transmission device to the storage unit or the digital image receiving device according to the switching signal.
Description
Technical field
The present invention is relevant with the transmission of digital image signal, particularly about a kind of DDC switching device shifter and DDC changing method.
Background technology
In recent years, because multimedia video technical development obtains quite rapidly, multi-media signal transmission system and multimedia and the display unit of various different types have been there is on the market.For example, as shown in Figure 1, the multimedia playing apparatus 11 with high frequency range digital content protection (High-bandwidth Digital Content Protection, HDCP) protection mechanism can be coupled to display 12 by switch 10.Wherein, switch 10 comprises Application Specific Integrated Circuit chip 100 and the microprocessor 102 that can process high frequency range digital content protection signal gold key (Key) and extend Identification display information (Extended Display Identification Data, EDID) signal.But, because switch 10 adopts the cost of Application Specific Integrated Circuit chip 100 quite high, for some low order machine, will cause the manufacturing cost of product too high.
In addition, as shown in Figure 2, switch 20 can comprise switch unit 200, time control unit 202 and extend Identification display information storage unit 204.But, its shortcoming is: the time that time control unit 202 is controlled is fixed, switch unit 200 can only switch once in the time powering on, once after exceeding the control time, multimedia playing apparatus 21 cannot read the extension Identification display information of extending in Identification display information storage unit 204 again, that is multimedia playing apparatus 21 only can carry out disposable reading for extending Identification display information, cause restriction very large in actual uses and inconvenient.
Summary of the invention
Therefore, the present invention proposes a kind of DDC switching device shifter and DDC changing method, the problems referred to above that suffered to solve prior art.
A specific embodiment according to the present invention is a kind of DDC switching device shifter.In this embodiment, DDC switching device shifter is coupled between digitized video conveyer and digitized video receiving system.DDC switching device shifter comprises DDC, storage element, switch unit and judging unit.DDC (DisplayData Channel; DDC) couple digitized video conveyer; extend Identification display information (ExtendedDisplay Identification Data in order to transmit; EDID) signal or high frequency range digital content protection (High-bandwidth DigitalContent Protection, HDCP) signal gold key.Storage element extends Identification display information data in order to store.Switch unit couples digitized video conveyer and storage element.Judging unit is coupled between digitized video conveyer and switch unit; be to extend Identification display information signal or high frequency range digital content protection signal gold key in order to what judge that DDC transmits, and produce switching signal to switch unit according to judged result.Switch unit is optionally coupled to digitized video conveyer storage element or digitized video receiving system according to switching signal.
In an embodiment, in the time that digitized video conveyer is coupled to digitized video receiving system by switch unit, between digitized video conveyer and digitized video receiving system, carry out the friendship of high frequency range digital content protection signal gold key and hold.
In an embodiment, in the time that digitized video conveyer is coupled to storage element by switch unit, digitized video conveyer reads the stored extension Identification display information data of storage element.
In an embodiment, judging unit is processing unit (PU), microprocessor (MCU), field programmable gate array (Field Programmable Gate Array, or complex programmable logic device (ComplexProgrammable Logic Device, CPLD) FPGA).
In an embodiment, the high-resolution image interface that the friendship of high frequency range digital content protection signal gold key is held is made in digitized video conveyer and the support of digitized video receiving system.
In an embodiment, switch unit is switch (Switch), selector (Selector) or multiplexer (Multiplexer).
In an embodiment, judging unit according to the positional information of signal whether for a numerical value is to extend Identification display information signal or high frequency range digital content protection signal gold key with what judge that DDC transmitted.
In another specific embodiment, DDC switching device shifter is coupled between digitized video conveyer and digitized video receiving system.DDC switching device shifter comprises DDC, storage element, channel selecting unit and judging unit.DDC couples digitized video conveyer, extends Identification display information signal or high frequency range digital content protection signal gold key in order to transmit.Storage element extends Identification display information data in order to store.Channel selecting unit has and couples the first passage of digitized video conveyer and storage element and couple digitized video conveyer and the second channel of digitized video receiving system.Judging unit is coupled between digitized video conveyer and channel selecting unit; be to extend Identification display information signal or high frequency range digital content protection signal gold key in order to what judge that DDC transmits, and produce channel selecting signal to channel selecting unit according to judged result.Channel selecting unit optionally reads the extension Identification display information signal of first passage or the high frequency range digital content protection signal gold key of second channel according to channel selecting signal.
Another specific embodiment according to the present invention is a kind of DDC changing method.In this embodiment, DDC changing method is in order to operate on the DDC switching device shifter being coupled between digitized video conveyer and digitized video receiving system.DDC switching device shifter comprises storage element and couples the DDC of digitized video conveyer.The method comprises the following steps: that (a) stores extension Identification display information data in storage element; (b) transmit extension Identification display information signal or high frequency range digital content protection signal gold key in DDC; (c) what judge that DDC transmits is to extend Identification display information signal or high frequency range digital content protection signal gold key, and produces switching signal according to judged result; (d) optionally digitized video conveyer is coupled to storage element or digitized video receiving system according to switching signal.
In another specific embodiment, the method comprises the following steps: that (a) stores extension Identification display information data in storage element; (b) transmit extension Identification display information signal or high frequency range digital content protection signal gold key in DDC; (c) what judge that DDC transmits is to extend Identification display information signal or high frequency range digital content protection signal gold key, and produces switching signal according to judged result; (d) if the judged result of step (c) is extension Identification display information signal; read the extension Identification display information signal between digitized video conveyer and storage device; if the judged result of step (c) is high frequency range digital content protection signal gold key, read the high frequency range digital content protection signal gold key between digitized video conveyer and digitized video receiving system.
Compared to prior art, what DDC switching device shifter proposed by the invention and DDC changing method transmitted by automatic decision DDC is that the mode selectivity switching digitized video conveyer that extends Identification display information signal or high frequency range digital content protection signal gold key is coupled to storage element or digitized video receiving system, therefore can get rid of the restriction that only can disposablely read extension Identification display information in prior art, and do not need to adopt expensive Application Specific Integrated Circuit chip process high frequency range digital content protection signal gold key simultaneously and extend Identification display information signal, extend Identification display information and hold communication with the friendship that display unit is carried out high frequency range digital content protection signal gold key and can take into account to read arbitrarily in the mode of low cost and low design complexities simultaneously.
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Accompanying drawing explanation
Fig. 1 is the switch that illustrates the employing Application Specific Integrated Circuit chip in prior art.
Fig. 2 illustrates only can provide the disposable switch that extends Identification display information that reads in prior art.
Fig. 3 is the schematic diagram illustrating according to the DDC switching device shifter of one embodiment of the invention.
Fig. 4 is the schematic diagram that illustrates DDC switching device shifter according to another embodiment of the present invention.
Fig. 5 is the flow chart that illustrates DDC changing method according to another embodiment of the present invention.
Fig. 6 is the flow chart that illustrates DDC changing method according to another embodiment of the present invention.
[main element symbol description]
S10 ~ S29: process step
10,20: switch 11,21: multimedia playing apparatus
12,22: display 100: Application Specific Integrated Circuit chip
102: microprocessor 200: switch unit
202: time control unit 204: extend Identification display information storage unit
3,4: DDC switching device shifter 30,40: DDC
32,42: storage element 34: switch unit
36,46: judging unit DT: digitized video conveyer
DR: digitized video receiving system EDID: extend Identification display information signal
SW: switching signal CS: channel selecting signal
HDCP Key: high frequency range digital content protection signal gold key
44: channel selecting unit CH1: first passage
CH2: second channel
Embodiment
A preferred embodiment according to the present invention is a kind of DDC switching device shifter.In this embodiment, DDC switching device shifter is coupled between digitized video conveyer and digitized video receiving system.Please refer to Fig. 3, Fig. 3 is the schematic diagram that illustrates the DDC switching device shifter of this embodiment.
As shown in Figure 3, DDC switching device shifter 3 is coupled between digitized video conveyer DT and digitized video receiving system DR.DDC switching device shifter 3 comprises DDC (Display Data Channel, DDC) 30, storage element 32, switch unit 34 and judging unit 36.Wherein, DDC 30 couples digitized video conveyer DT; Storage element 32 couples switch unit 34; Switch unit 34 couples digitized video conveyer DT and storage element 32; Judging unit 36 is coupled between digitized video conveyer DT and switch unit 34.
In this embodiment; DDC 30 extends Identification display information (Extended DisplayIdentification Data in order to transmit; EDID) signal EDID or high frequency range digital content protection (High-bandwidth DigitalContent Protection, HDCP) signal gold key HDCP Key.Storage element 32 extends Identification display information data in order to store.Judging unit 36 is to extend Identification display information signal EDID or high frequency range digital content protection signal gold key HDCP Key in order to the signal that judges DDC 30 and transmit actually, and produces switching signal SW to switch unit 34 according to judged result.Switch unit 34 is optionally coupled to digitized video conveyer DT storage element 32 or digitized video receiving system DR according to switching signal SW.
In practical application, what whether the positional information of the signal that judging unit 36 transmits according to DDC 30 for example, judged that DDC 30 transmits for a numerical value (positional information Address=A0) is to extend Identification display information signal EDID or high frequency range digital content protection signal gold key HDCP Key.
For example, if the positional information Address=A0 of the signal that DDC 30 transmits, what judging unit 36 judged that DDC 30 transmits is to extend Identification display information signal EDID, and producing switching signal SW to switch unit 34 according to this judged result, switch unit 34 is coupled to storage element 32 according to switching signal SW by digitized video conveyer DT.When switch unit 34 is coupled to digitized video conveyer DT after storage element 32, digitized video conveyer DT can read the stored extension Identification display information data of storage element 32.
If the positional information Address ≠ A0 of the signal that DDC 30 transmits; that judging unit 36 judges that DDC 30 transmits is high frequency range digital content protection signal gold key HDCP Key; and producing switching signal SW to switch unit 34 according to this judged result, switch unit 34 is coupled to digitized video receiving system DR according to switching signal SW by digitized video conveyer DT.In the time that digitized video conveyer DT is coupled to digitized video receiving system DR by switch unit 34, between digitized video conveyer DT and digitized video receiving system DR, will carry out the friendship of high frequency range digital content protection signal gold key HDCP Key and hold.
In practical application, digitized video conveyer DT and digitized video receiving system DR all support the high-resolution image interface that the friendship that can carry out high frequency range digital content protection signal gold key is held.Judging unit 36 can be processing unit (PU), microprocessor (MCU), field programmable gate array (Field Programmable Gate Array, or complex programmable logic device (Complex Programmable Logic Device, CPLD) FPGA).Switch unit 34 can be switch (Switch), selector (Selector) or multiplexer (Multiplexer).But be not all limited with above-mentioned.
Another preferred embodiment according to the present invention is a kind of DDC switching device shifter.In this embodiment, DDC switching device shifter is coupled between digitized video conveyer and digitized video receiving system.Please refer to Fig. 4, Fig. 4 is the schematic diagram that illustrates the DDC switching device shifter of this embodiment.
As shown in Figure 4, DDC switching device shifter 4 is coupled between digitized video conveyer DT and digitized video receiving system DR.DDC switching device shifter 4 comprises DDC 40, storage element 42, channel selecting unit 44 and judging unit 46.Wherein, channel selecting unit 44 has and couples the first passage CH1 of digitized video conveyer DT and storage element 42 and couple digitized video conveyer DT and the second channel CH2 of digitized video receiving system DR.DDC 40 couples digitized video conveyer DT; Judging unit 46 is coupled to DDC 40.First passage CH1 and second channel CH2 can be DDC and form.
In this embodiment, DDC 40 extends Identification display information signal EDID or high frequency range digital content protection signal gold key HDCP Key in order to transmit.Storage element 42 extends Identification display information data in order to store.Judging unit 46 is to extend Identification display information signal EDID or high frequency range digital content protection signal gold key HDCP Key in order to the signal that judges DDC 40 and transmit actually, and produces channel selecting signal CS to channel selecting unit 44 according to judged result.Channel selecting unit 44 optionally reads the extension Identification display information signal EDID of first passage CH1 or the high frequency range digital content protection signal gold key HDCP Key of second channel CH2 according to channel selecting signal CS.
In practical application, what whether the positional information of the signal that judging unit 46 transmits according to DDC 40 for example, judged that DDC 40 transmits for a numerical value (positional information Address=A0) is to extend Identification display information signal EDID or high frequency range digital content protection signal gold key HDCP Key.
For example, if the positional information Address=A0 of the signal that DDC 40 transmits, what judging unit 46 judged that DDC 40 transmits is to extend Identification display information signal EDID, and produces channel selecting signal CS to channel selecting unit 44 according to this judged result.Channel selecting unit 44 reads the extension Identification display information signal EDID of first passage CH1 according to channel selecting signal CS, now, digitized video conveyer DT will read the stored extension Identification display information data of storage element 42.
If the positional information Address ≠ A0 of the signal that DDC 40 transmits; that judging unit 46 judges that DDC 40 transmits is high frequency range digital content protection signal gold key HDCP Key, and produces channel selecting signal CS to channel selecting unit 44 according to this judged result.Channel selecting unit 44 reads the high frequency range digital content protection signal gold key HDCP Key of second channel CH2 according to channel selecting signal CS; now, the friendship that will carry out high frequency range digital content protection signal gold key HDCPKey between digitized video conveyer DT and digitized video receiving system DR is held.
Another specific embodiment according to the present invention is a kind of DDC changing method.In this embodiment, DDC changing method is in order to operate on the DDC switching device shifter being coupled between digitized video conveyer and digitized video receiving system.DDC switching device shifter comprises storage element and couples the DDC of digitized video conveyer.Please refer to Fig. 5, Fig. 5 is the flow chart that illustrates the DDC changing method of this embodiment.
As shown in Figure 5, in step S10, the method stores extends Identification display information (EDID) data in storage element.In step S12, the method transmission extension Identification display information signal or high frequency range digital content protection signal gold key are in DDC.In step S14, what the method judged that DDC transmits is to extend Identification display information (EDID) signal or high frequency range digital content protection (HDCP) signal gold key.If what the judged result of step S14 transmitted for DDC is to extend Identification display information (EDID) signal, the method execution step S16, is coupled to storage element by digitized video conveyer.Then, the method execution step S17, digitized video conveyer reads the stored extension Identification display information data of storage element.
If what the judged result of step S14 transmitted for DDC is high frequency range digital content protection (HDCP) signal gold key, the method execution step S18, is coupled to digitized video receiving system by digitized video conveyer.Then, the method execution step S19, carries out the friendship of high frequency range digital content protection (HDCP) signal gold key and holds between digitized video conveyer and digitized video receiving system.
Another specific embodiment according to the present invention is a kind of DDC changing method.In this embodiment, DDC changing method is in order to operate on the DDC switching device shifter being coupled between digitized video conveyer and digitized video receiving system.DDC switching device shifter comprises storage element and couples the DDC of digitized video conveyer.Please refer to Fig. 6, Fig. 6 is the flow chart that illustrates the DDC changing method of this embodiment.
As shown in Figure 6, in step S20, the method stores extends Identification display information data in storage element.In step S22, the method transmission extension Identification display information signal or high frequency range digital content protection signal gold key are in DDC.In step S24, what the method judged that DDC transmits is to extend Identification display information signal or high frequency range digital content protection signal gold key.
If what the judged result of step S24 transmitted for DDC is to extend Identification display information (EDID) signal, the method execution step S26, reads the extension Identification display information signal between digitized video conveyer and storage device.
If what the judged result of step S24 transmitted for DDC is high frequency range digital content protection (HDCP) signal gold key; the method execution step S29, carries out the friendship of high frequency range digital content protection (HDCP) signal gold key and holds between digitized video conveyer and digitized video receiving system.
Compared to prior art, DDC switching device shifter proposed by the invention and DDC changing method are that what to transmit by automatic decision DDC is the mode of extending Identification display information signal or high frequency range digital content protection signal gold key, selectivity is switched digitized video conveyer and is coupled to storage element or digitized video receiving system, therefore can get rid of the restriction that only can disposablely read extension Identification display information in prior art, and do not need to adopt expensive Application Specific Integrated Circuit chip process high frequency range digital content protection signal gold key simultaneously and extend Identification display information signal, extend Identification display information and hold communication with the friendship that display unit is carried out high frequency range digital content protection signal gold key and can take into account to read arbitrarily in the mode of low cost and low design complexities simultaneously.
By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and not with above-mentioned disclosed preferred embodiment, category of the present invention is limited.On the contrary, its objective is that hope can contain in the category of the scope of the claims of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (21)
1. a DDC switching device shifter, is coupled between a digitized video conveyer and a digitized video receiving system, and this DDC switching device shifter comprises:
One DDC, couples this digitized video conveyer, extends Identification display information signal or high frequency range digital content protection signal gold key in order to transmit;
One storage element, in order to store an extension Identification display information data;
One switch unit, couples this digitized video conveyer and this storage element; And
One judging unit, be coupled between this digitized video conveyer and this switch unit, be to extend Identification display information signal or high frequency range digital content protection signal gold key in order to what judge that this DDC transmits, and produce a switching signal to this switch unit according to judged result;
Wherein, this switch unit is optionally coupled to this digitized video conveyer this storage element or this digitized video receiving system according to this switching signal.
2. DDC switching device shifter as claimed in claim 1; it is characterized in that; in the time that this digitized video conveyer is coupled to this digitized video receiving system by this switch unit, between this digitized video conveyer and this digitized video receiving system, carry out the friendship of high frequency range digital content protection signal gold key and hold.
3. DDC switching device shifter as claimed in claim 1, it is characterized in that, in the time that this digitized video conveyer is coupled to this storage element by this switch unit, this digitized video conveyer reads this stored extension Identification display information data of this storage element.
4. DDC switching device shifter as claimed in claim 1, is characterized in that, this judging unit is processing unit, microprocessor, field programmable gate array or complex programmable logic device.
5. DDC switching device shifter as claimed in claim 1, is characterized in that, the high-resolution image interface that the friendship of high frequency range digital content protection signal gold key is held is carried out in this digitized video conveyer and this digitized video receiving system support.
6. DDC switching device shifter as claimed in claim 1, is characterized in that, this switch unit is switch, selector or multiplexer.
7. DDC switching device shifter as claimed in claim 1; it is characterized in that, whether a positional information of the signal that this judging unit transmits according to this DDC is for a numerical value is to extend Identification display information signal or high frequency range digital content protection signal gold key with what judge that this DDC transmitted.
8. a DDC switching device shifter, is coupled between a digitized video conveyer and a digitized video receiving system, and this DDC switching device shifter comprises:
One DDC, couples this digitized video conveyer, extends Identification display information signal or high frequency range digital content protection signal gold key in order to transmit;
One storage element, in order to store an extension Identification display information data;
One channel selecting unit, has a first passage and that couples this digitized video conveyer and this storage element and couples the second channel of this digitized video conveyer and this digitized video receiving system; And
One judging unit, be coupled between this digitized video conveyer and this channel selecting unit, be to extend Identification display information signal or high frequency range digital content protection signal gold key in order to what judge that this DDC transmits, and produce a channel selecting signal to this channel selecting unit according to judged result;
Wherein, this channel selecting unit reads the extension Identification display information signal of this first passage or the high frequency range digital content protection signal gold key of this second channel according to this channel selecting signal selectivity.
9. DDC switching device shifter as claimed in claim 8, is characterized in that, the high-resolution image interface that the friendship of high frequency range digital content protection signal gold key is held is carried out in this digitized video conveyer and this digitized video receiving system support.
10. DDC switching device shifter as claimed in claim 8; it is characterized in that, whether a positional information of the signal that this judging unit transmits according to this DDC is for a numerical value is to extend Identification display information signal or high frequency range digital content protection signal gold key with what judge that this DDC transmitted.
11. DDC switching device shifters as claimed in claim 8, it is characterized in that, in the time that this channel selecting unit reads the extension Identification display information signal of this first passage, this digitized video conveyer reads this stored extension Identification display information data of this storage element.
12. DDC switching device shifters as claimed in claim 8; it is characterized in that; in the time that this channel selecting unit reads the high frequency range digital content protection signal gold key of this second channel, between this digitized video conveyer and this digitized video receiving system, will carry out the friendship of high frequency range digital content protection signal gold key and hold.
13. DDC switching device shifters as claimed in claim 1, is characterized in that, this judging unit is processing unit, microprocessor, field programmable gate array or complex programmable logic device.
14. 1 kinds of DDC changing methods, in order to operate on the DDC switching device shifter being coupled between a digitized video conveyer and a digitized video receiving system, this DDC switching device shifter comprises a storage element and couples a DDC of this digitized video conveyer, and the method comprises the following step:
(a) store one and extend Identification display information data in this storage element;
(b) transmit an extension Identification display information signal or a high frequency range digital content protection signal gold key in this DDC;
(c) what judge that this DDC transmits is this extension Identification display information signal or this high frequency range digital content protection signal gold key, and produces a switching signal according to judged result; And
(d) optionally this digitized video conveyer is coupled to this storage element or this digitized video receiving system according to this switching signal.
15. DDC changing methods as claimed in claim 14; it is characterized in that; in step (d); if this digitized video conveyer is coupled to this digitized video receiving system, between this digitized video conveyer and this digitized video receiving system, carries out the friendship of high frequency range digital content protection signal gold key and hold.
16. DDC changing methods as claimed in claim 14, it is characterized in that, in step (d), if this digitized video conveyer is coupled to this storage element, this digitized video conveyer reads this stored extension Identification display information data of this storage element.
17. DDC changing methods as claimed in claim 14, is characterized in that, the high-resolution image interface that the friendship of high frequency range digital content protection signal gold key is held is carried out in this digitized video conveyer and this digitized video receiving system support.
18. 1 kinds of DDC changing methods, in order to operate on the DDC switching device shifter being coupled between a digitized video conveyer and a digitized video receiving system, this DDC switching device shifter comprises a storage element and couples a DDC of this digitized video conveyer, and the method comprises the following step:
(a) store one and extend Identification display information data in this storage element;
(b) transmit extension Identification display information signal or high frequency range digital content protection signal gold key in this DDC;
(c) what judge that this DDC transmits is to extend Identification display information signal or high frequency range digital content protection signal gold key; And
(d) if the judged result of step (c) is extension Identification display information signal; read the extension Identification display information signal between this digitized video conveyer and this storage device; if the judged result of step (c) is high frequency range digital content protection signal gold key, read the high frequency range digital content protection signal gold key between this digitized video conveyer and this digitized video receiving system.
19. DDC changing methods as claimed in claim 18; it is characterized in that; in step (d); if read the high frequency range digital content protection signal gold key between this digitized video conveyer and this digitized video receiving system, carry out the friendship of high frequency range digital content protection signal gold key between this digitized video conveyer and this digitized video receiving system and hold.
20. DDC changing methods as claimed in claim 18, it is characterized in that, in step (d), if read the extension Identification display information signal between this digitized video conveyer and this storage device, this digitized video conveyer reads this stored extension Identification display information data of this storage element.
21. DDC changing methods as claimed in claim 18, is characterized in that, the high-resolution image interface that the friendship of high frequency range digital content protection signal gold key is held is made in this digitized video conveyer and this digitized video receiving system support.
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| Application Number | Priority Date | Filing Date | Title |
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| TW101149797 | 2012-12-25 | ||
| TW101149797A TWI544801B (en) | 2012-12-25 | 2012-12-25 | Display data channel switching apparatus and display data channel switching method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103905767B (en) | 2017-07-25 |
| TW201427423A (en) | 2014-07-01 |
| TWI544801B (en) | 2016-08-01 |
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